Pontiac Fiero 1988 Service Manual page 1098

W I P E R / W A S H E R : P U L S E
mm.
(Continued from previous page)
• Wiper Switch: OFF
• Washer Switch: ON
C (GEY) &
Ground
Battery
See 4
© If all the voltages are correct but the Wiper
Motor Module does not operate normally,
remove the Wiper Motor Module for repair.
See Section 8E for diagnostic procedures.
1. Check the WHT (93) wire for an open back
to the WIPER Fuse.
2. Check the GRY (91) wire for an open. If the
wire is good, replace the Wiper/Washer
Switch.
3. Check the PPL (92) wire for an open. If the
wire is good, replace the Wiper/Washer
Switch.
4. Replace the Wiper/Washer Switch.
C : W I P E R / W A S H E R P U L S E C O I
R E S I S T A N C E T E S T
Measure: RESISTANCE
At: WIPER MOTOR MODULE CONNECTOR
(Disconnected)
Conditions:
• Ignition Switch: OFF
© Negative Battery Terminal:
DISCONNECTED
o Wiper Switch: LO
© Ohmmeter positive lead to terminal
A (WHT)
Measure
Between
A (WHT) &
C (GRY)
Correct
iesistance
Approx.
10 K ohms
For Diagnosis
Seel
(Continued in next column)
(Continued from previous column)
• Move the Wiper Switch through delay
range to the maximum delay position
A (WHT) &
C (GRY)
Resistance
increases to
approximately
500 K ohms
Seel
• If the resistances are correct but the pulse
mode does not operate, remove the Wiper
Motor Module for repair (see Section 8E for
diagnostic instructions). •
1. Check the WHT (93) and GRY (91) wires
for opens. If the wires are good, replace
the Wiper/Washer Switch.
D: W A S H E R PUMP T E S T fTABLE 1)
Measure: VOLTAGE
At: WIPER MOTOR MODULE (Connected)
Conditions:
• Ignition Switch: ACCY
• Washer Switch: ON
Measure Correct
For Diagnosis
Between
Voltage
For Diagnosis
C (GRY) &
Ground
Battery Seel
B (ORN) &
Ground
Battery See 2
© If the voltages are correct, go to Table 2.
1. Check the GRY (91) wire for an open. If the
wire is good, replace the Wiper/Washer
Switch.
2. Replace the Control Board.
D: WASHER PUMP T E S T (TABLE 2)
Measure: VOLTAGE
Af
WASHER PUMP (Disconnected)
Conditions:
• Ignition Switch: ACCY
• Washer Switch: ON
Measure
Between
A (PNK) &
Ground
A (PNK) &
B (BLK)
Correct
Voltage
Battery
Battery
For Diagnosis
See 1
See 2
• If the voltages are correct, replace the
Washer Pump (see Section 8E for the
procedure).
1. Check the ORN (98) and PNK (94) wires
for an open. If they are good, replace the
Wiper/Washer Switch.
2. Check the BLK (150) wire for an open to
ground.
C I R C U I T O P E R A T I O N
The Wiper/Washer Switch sends signals to the
Solid State Pulse/Speed/Wash Control which is
mounted inside the Wiper Motor Module.
The Wiper Motor is protected by a built-in Cir-
cuit Breaker. If the Wipers are blocked (by ice
on the windshield, for example), the Circuit
Breaker opens. The Circuit Breaker resets itself
when it cools.
LOW SPEED
Battery voltage is applied to the Wiper/
Washer Switch and the Park/Run Relay through
the WHT (93) wires. With the Wiper/Washer
(Continued on next page)